What mechanism can users implement in PowerPoint to enhance presentation security?

Setting a password is an effective mechanism for enhancing presentation security in PowerPoint. By applying a password to a presentation, users can restrict access, ensuring that only those with the correct credentials can view or edit the content. This added layer of protection is particularly important when dealing with sensitive information or proprietary material, as it helps prevent unauthorized access and potential data breaches.

Other options do not provide any security benefits. For instance, using animations enhances visual appeal but has no impact on securing the content. Reducing slide numbers may streamline the presentation but does not affect security. Similarly, embedding audio clips can enhance the storytelling aspect of a presentation, yet it does not provide any safeguard for the presentation itself.